Unofficial Neovim channel

[HiPhish]

Hello Guix developers,

I have set up an unofficial Guix channel for Neovim (and possibly for related 
projects in the future):

https://gitlab.com/HiPhish/neovim-guix-channel/

The plan is to use this channel first, and then submit patches to Guix when 
everything is deemed correct and reliable. I also wrote a blog post[1] on the 
topic, although it's primarily addressed at people familiar with Neovim and 
unfamiliar with Guix. I would very much appreciate if someone could go over 
the code in my channel and see if everything is in order.

HiPhish

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[1] http://hiphish.github.io/blog/2019/01/21/neovim-guix-channel/